Malik

Senior Backend Software Engineer - AKSA Business Technologies (JazzCash)

(2025-04)

Architected microservices platform serving 5M+ daily financial transactions at 99.99% availability with API Gateway routing, service discovery, and circuit-breaker patterns
Led end-to-end R&D and backend integration of Apple in-app provisioning, implementing cryptographic protocols for secure card tokenization integrated with Apple Pay infrastructure
Increased system throughput 3x by decoupling Kafka streams and Redis caching, reducing API latency 60% and eliminating connection pool bottlenecks
Integrated payment gateway for 5M+ daily payments with retry logic and idempotency guarantees ensuring zero payment loss, enforced OAuth2/AES-256 encryption
Optimized MongoDB aggregation pipelines for financial analytics dashboards, reduced query latency 40% with compound indexes and pipeline stages
Designed Prometheus and Grafana observability platform capturing request tracing and error clustering, reduced MTTF 30% and eliminated production blind spots
On-call incident response maintaining 99.99% SLA, investigated P1 incidents in payment flows and infrastructure

Full Stack Engineer - Vizz Web Solutions Pvt. Ltd

(2023-07 - 2025-03)

Migrated monolithic system to microservices architecture, reduced deployment time 70%, improved fault isolation, enabled independent team deployments
Decoupled invoice generation and email delivery from checkout flow, removed 2-3s blocking bottleneck, improved checkout success rate and reduced customer friction
Achieved 100% checkout reliability under high traffic through load balancing, connection pooling, and query optimization with centralized logging
Built modular microservices for user management, analytics, and templates tracking invoice trends, peak hours, and revenue metrics
Implemented Redis caching across product data and analytics, reduced dashboard latency 70% and checkout performance improved 40%
Integrated Stripe APIs for subscriptions and billing, containerized services with Docker, orchestrated deployments on AWS with zero-downtime CI/CD

Node.js Developer - Digital Sensei Technology

(2022-07 - 2023-06)

Scaled REST API from hundreds to thousands of DAU with token-bucket rate-limiting using Redis, prevented API abuse and connection exhaustion, maintained <200ms p99 latency
Maintained sub-200ms p99 latency during 10x traffic spikes through event loop profiling, SQL optimization, read replicas, and Redis connection pooling
Built MongoDB transaction workflows ensuring data consistency across financial and user operations with atomic operations for payments
Automated backend processes with cron jobs, integrated Twilio and email systems for real-time transactional alerts affecting millions monthly

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